From 867258d3f37da1ef2023d9857b0af533e745e050 Mon Sep 17 00:00:00 2001 From: Randy Dunlap Date: Mon, 28 Feb 2022 14:04:53 -0800 Subject: [PATCH] dma-debug: fix return value of __setup handlers [ Upstream commit 80e4390981618e290616dbd06ea190d4576f219d ] When valid kernel command line parameters dma_debug=off dma_debug_entries=100 are used, they are reported as Unknown parameters and added to init's environment strings, polluting it. Unknown kernel command line parameters "BOOT_IMAGE=/boot/bzImage-517rc5 dma_debug=off dma_debug_entries=100", will be passed to user space. and Run /sbin/init as init process with arguments: /sbin/init with environment: HOME=/ TERM=linux BOOT_IMAGE=/boot/bzImage-517rc5 dma_debug=off dma_debug_entries=100 Return 1 from these __setup handlers to indicate that the command line option has been handled. Fixes: 59d3daafa1726 ("dma-debug: add kernel command line parameters") Signed-off-by: Randy Dunlap Reported-by: Igor Zhbanov Link: lore.kernel.org/r/64644a2f-4a20-bab3-1e15-3b2cdd0defe3@omprussia.ru Cc: Joerg Roedel Cc: Christoph Hellwig Cc: Marek Szyprowski Cc: iommu@lists.linux-foundation.org Cc: Robin Murphy Signed-off-by: Christoph Hellwig Signed-off-by: Sasha Levin --- kernel/dma/debug.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c index 10d07ace46c1..f8ae54679865 100644 --- a/kernel/dma/debug.c +++ b/kernel/dma/debug.c @@ -928,7 +928,7 @@ static __init int dma_debug_cmdline(char *str) global_disable = true; } - return 0; + return 1; } static __init int dma_debug_entries_cmdline(char *str) @@ -937,7 +937,7 @@ static __init int dma_debug_entries_cmdline(char *str) return -EINVAL; if (!get_option(&str, &nr_prealloc_entries)) nr_prealloc_entries = PREALLOC_DMA_DEBUG_ENTRIES; - return 0; + return 1; } __setup("dma_debug=", dma_debug_cmdline);